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jawaban no27
luas tembereng = luas juring - luas sgtiga = 1/4 x 22/7 × 3.5 × 3.5 - 1/2 × 3.5 × 3.5 = 77/8-
49/8=7/2 = 3.5 cm^2
Jawaban no28
sudut ABC = 360-168-2(48)= 96°

27.)
Luas juring =
1/4 × phi × r^2 =
1/4 × 22/7 × 3,5 =
9,625cm^2

luas segitiga =
a × t / 2 =
1/2 × 3.5 × 3.5 =
6,125 cm^2

Luas tembereng = 9,625 - 6,125 = 3,5cm^2 ( A )

28.)

SUDUT ABC =
(360 - 198) / 2 =
192 / 2 =
96derajat (b)