Question

Find the measure of ∠1:
a. 100⁰
b. 130⁰
c 135⁰
d. 65⁰​

Answer 1

Answer:

135°. [by exterior angle property]

Answer 2

Answer:

let the third angle in the triangle = m

m + 55 + 80 = 180°(angle sum property)

m = 180 -55 -80

m = 45°

now m + ∠1 = 180° (linear pair)

∠1 = 180-45

∠1 = 135°

therefore, c. 135°

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