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## Triangle

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**Definition**Triangel is a equilateral which have three straigh sides and three angles**Types Of Triangel**• Based on the length of the sides • Equilateral triangle is a triangel having three congruent sides • Isosceles triangel is a triangel having two congruent sides • Scalen triangle is a triangel having no congruent sides**Based on measure of the angle**• Right triangle is a triangle that has one 90° angle • Obtuse angle is triangle that has one obtuse angel, >90° • Acute triangel is a triangel that has three acute angel, <90° C A B**Based on the angel two sides**• Right isosceles triangle is a triangle that has one 90° angle and two equal sides • Obtuse isosceles triangle is a triangle that has one obtuse angle >90° and two equal sides • Acute isosceles triangle is a triangle that has one acute angle <90° and two equal sides**The Sum Of A Triangle**The sum of all angle in a triangle is 180° Example: X= 180°-(55°+65°) X= 60° Or X+55°+65°=180° X+120= 180° x=60° x 55 65**The sum of two sudes in each triangle always more long from**third side, if a, b, c, is triangle’s sides, so the all of them must fullfill a + b > c a +c + > b b +c > a**Special Line Of Triangel**• High line is line which interested from a vertex and upright with side in front of it • Devided line is line which devide a triangel’s vertex to two vertex same sides • weight line is lin which interested from a vertex to central point side in front of it • exist line is line which interestedfrom a central point side and upright with that side**Perimeter and area of triangle**P=a+b+c If P is perimeter of a triangle having the side a,b and c, then the perimeter of triangle can be stated as P=a+b+c a b c**The exterior and interior angels of a triangle**• An exterior angels of a triangle is an angles formed by the side of the of a triangle with the extension of the other side of triangle. • An interior angle of a triangle is an angle formed by the side of a triangle with the intension of the other side of the triangle**U**<T,<U, and <TSU are the interior angle of <RSU is the exterior angle of The measure of an exterior angle of a triangle is equal to the sum of two interior angles which aren’t supplementary to the exterior angle. R S T STU TSU**MEMBERS:**-IndraAulia Rahman (9) -Nurita A. Tyas (14) -Nurita A. Rizfa (15) -Realita Mustika Dewi (18) -Siswanto Adi Wijanarko (22)