Question

Nomer 30 dan 31. ada yang bisa?

Answer 1

30. 72:360 × 3.14 × 20 × 20 = 251.2

Answer 2

Nomor 30.
Luas juring
= a/360° x π r²
= 72/360 x 3,14 x 20²
= 1/5 x 3,14 x 400
= 1/5 x 1.256
= 251,2 cm² [C]

Nomor 31.
AP = 12 cm
BQ = 4 cm
PQ = 15 cm
Berlaku:
AB² = PQ² + (AP-BQ)²
AB² = 15² + (12-4)²
AB² = 225 + 64
AB² = 289
AB = √289
AB = 17 cm [A]