Question

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Answer 1

(A) y = 30 + 70 = 100°

(B) y = 55 + 35 = 90°

(C) y = 115 - 45 = 70°

(D) y = 180 - 80 = 100°

Answer 2

Answer:

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Step-by-step explanation:

(a) let the third angle be x°

30+70+x=180 (angle sum property)

100+x=180°

x=180-100=80°

(b) let the third angle be x°

55+35+x=180 (angle sum property)

90+x=180°

x=180-90=90°

(c)let the third angle be x°

x+115=180. (supplementary angle)

x=180-115°

x=65°

y+x+45=180°(angle sum property)

y+165+45=180°

y=180-65-45

y=70°

(d) 50+30+y = 180°(angle sum property)

80+y=180

y=180-80=100

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