28. 180 - p = 3 (90-p)
180 - p = 270 - 3p
180 - 270 = - 3 p + p
-90 = -2p
p = 45° (C)
29. L diarsir = L total - L tidak di arsir
= 72/360 × 22/7 × 14 × 14 - 72/360 × 22/7 × 7 × 7
= 123,2 - 30,8
= 92,4 cm2 (B)
semoga membantu maaf kalau ada yang kurang tepat
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28. 180 - p = 3 (90-p)
180 - p = 270 - 3p
180 - 270 = - 3 p + p
-90 = -2p
p = 45° (C)
29. L diarsir = L total - L tidak di arsir
= 72/360 × 22/7 × 14 × 14 - 72/360 × 22/7 × 7 × 7
= 123,2 - 30,8
= 92,4 cm2 (B)
semoga membantu maaf kalau ada yang kurang tepat