Question

No 7 pake cara nya ya.... plisss

Answer 1

Sudut DAB = Sudut BCD
2x - 10 = x + 15
2x - x = 15 + 10
x = 25

Sudut DAB
= 2x - 10
= 2×25 - 10
= 50 - 10
= 40°

Sudut ABC
= 180° - Sudut DAB
= 180° - 40°
= 140°

Jawaban: C

Answer 2

∠BAD = ∠BCD
⇒ (2x - 10) = (x + 15)
⇒ 2x - x = 15 + 10
⇒ x = 25°

maka

∠ABC = 180° - ∠BAD
           = 180 - (2x - 10)
           = 180 - (2(25) - 10)
           = 180 - 40
           = 140°


Jawab : C
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