1 / 13

Siâp a Gofod / Shape and Space

Siâp a Gofod / Shape and Space. GRADD / DEGREE. GRADD / DEGREE. Rydym yn defnyddio graddau (e.e. 90 °) i fesur onglau We use degrees (e.g. 90 °) to measure angles. Troad Cyfan Full Turn (360 °). Ongl Sgw â r Right Angle (90 °). Llinell Syth Straight Line (180 °). Ongl Atblyg

randall-hampton
Télécharger la présentation

Siâp a Gofod / Shape and Space

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Siâp a Gofod / Shape and Space GRADD / DEGREE

  2. GRADD / DEGREE • Rydym yn defnyddio graddau (e.e. 90°) i fesur onglau • We use degrees(e.g. 90°) to measure angles Troad Cyfan Full Turn (360 °) Ongl Sgwâr Right Angle (90°) Llinell Syth Straight Line (180°) Ongl Atblyg (llai na 360°, mwy na 180°) Reflex Angle (less than 360°, more than 180°) Ongl Aflem (llai na 180°, mwy na 90°) Obtuse Angle (less than 180°, more than 90°) Ongl Lem (llai na 90°) Acute Angle (less than 90°)

  3. 3) 2) 4) 1) 7) 8) 6) 5) 9) 11) 10) YMARFERION / EXERCISES • Disgrifiwch pob ongl fel / Describe the following as: • a) Ongl Sgwâr b) Llinell Syth c) Ongl Lem ch) Ongl Aflem d) Ongl Atblyg • a) Right Angle b) Straight Line c) Acute Angle d) Obtuse Angle e) Reflex Angle

  4. MESUR ONGLAU / MEASURING ANGLES • Rydym yn defnyddio ONGLYDD i fesur onglau. • We use a PROTRACTOR to measure angles. • Mae graddfa glocwedd a gwrthglocwedd ar yr onglydd • A protractor has a clockwise and anticlockwise scale • Os yw ongl yn troi (agor) yn glocwedd • mae angen defnyddio’r raddfa allanol • If an angle turns (opens) clockwise • you must use the external scale • Os yw ongl yn troi (agor) yn • wrthglocwedd mae angen • defnyddio’r raddfa fewnol • If an angle turns (opens) anticlockwise • you must use the internal scale

  5. MESUR ONGLAU / MEASURING ANGLES • Cam 1: Rhoi canol yr onglydd ar • gornel yr ongl • Step 1: Put the centre of the • protractor on the corner of the angle • Cam 2: Troi’r onglydd fel bo 0° ar • un o’r llinellau • Step 2: Turn the protractor so that • 0° is on one of the lines • Cam 3: Mesur i gyfeiriad yr ongl gan • gyfri 10°, 20°, 30° ac yn y blaen • Step 3: Start to count in the direction • of the angle 10°, 20°, 30° etc 70° 60° 50° 40° 30° 20° 10° 0° Cwblhewch y taflenni gwaith Complete the worksheets

  6. CREU ONGL 70° / CREATING A 70° ANGLE • Cam 1: Rhoi canol yr onglydd ar ben • llinell syth • Step 1: Put the centre of the • protractor on the end of a straight line • Cam 2: Troi’r onglydd fel bod 0° • ar y llinell. • Step 2: Turn the protractor so that • 0° is on the line • Cam 3:Mesur i gyfeiriad yr ongl gan • gyfri 10°, 20°, 30° ac yn y blaen. • Step 3: Start to count in the direction • of the angle 10°, 20°, 30° etc • Cam 4: Rhoi dot ar 70° • Step 4: Put a dot on 70° • Cam 5: Cysylltu’r dot â phen y llinell • Step 5: Connect the dot with the end • of the straight line 70° 60° 50° 40° 30° 70° 20° 10° 0°

  7. Gan ddefnyddio Onglydd a Pren Mesur, dyluniwch yr onglau canlynol yn eich llyfrau. Labelwch pob ongl fel hyn :- Using a Protractor and Ruler, create these angles in your books. Label each angle like this :- 35° YMARFERION / EXERCISES • 60° • 45° • 130° • 145° • 75° • 105° • 57° • 168° • 23°

  8. a 162° 80° b LLINELL SYTH / STRAIGHT LINE (180°) • Nid ydym bob amser yn darganfod onglau drwy eu mesur. Gallwn gyfrifo onglau. • We don’t always find angles by measuring. We can calculate angles. • Mae onglau ar linell syth yn adio i 180° • Angles on a straight line add to 180° b = 180° – 162° b = 18° a = 180° – 80° a = 100°

  9. 138° a b c 65° 50° f 117° 103° e 72° d 64° 50° g 30° 100° h 20° i YMARFERION / EXERCISES • Cyfrifwch yr onglau sydd wedi eu marcio â llythrennau • Calculate the angles labelled with letters

  10. a b 290° 235° TROAD CYFAN / FULL TURN (360°) • Nid ydym bob amser yn darganfod onglau drwy eu mesur. Gallwn gyfrifo onglau. • We don’t always find angles by measuring. We can calculate angles. • Mae’r onglau o amgylch pwynt yn gwneud troad cyfan. Mae nhw’n adio i roi cyfanswm o 360° • Angles around a point make a full turn. • They add to make a total of 360° a = 360° – 290° a = 70° b = 360° – 235° b = 125°

  11. c 24° d 82° 32° a b 285° e 156° h f 44° 130° 170° 88° g 147° 134° YMARFERION / EXERCISES • Cyfrifwch yr onglau sydd wedi eu marcio â lythrennau • Calculate the angles labelled with letters

  12. 150° 120° x z q 60° y p CYFERBYN / OPPOSITE • Nid ydym bob amser yn darganfod onglau drwy eu mesur. Gallwn gyfrifo onglau • We don’t always find angles by measuring. We can calculate angles • Mae’r onglau CYFERBYN yn hafal. Mae hyn yn digwydd pan fo dwy • linell yn croesi. Mae un ONGLGOCH ac un ONGL LAS yn adio i 180° • The OPPOSITE angles are equal. This happens when two lines cross each other. • One RED ANGLE and one BLUE ANGLE add to 180° y = 150° x = 30° z = 30° q = 60° p = 120°

  13. 135° 145° 35° a 40° c d b f e g 29° 150° 151° 40° j L h i k 35° r s o n p 77° t q m u YMARFERION / EXERCISES • Cyfrifwch yr onglau sydd wedi eu marcio â lythrennau • Calculate the angles labelled with letters

More Related