среда, 29 марта 2017 г.

Lesson 10. Isosceles and equilateral trianqles


EXAMPLE:
a = 73  (isosceles triangle)
b + 73 + 73 = 180  (angles in a triangle add up to 180)
b = 34

EXAMPLE:
p = 49  (vertically opposite)
q = p = 49  (isosceles triangle)
r + 49 + 49 = 180  (angles in a triangle add up to 180)
r = 82

Angle proof.

Prove that triangle ABC is isosceles.
Give all your reasons clearly.

Test lesson 10

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