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atas = 32 cm
bawah = 58 cm
tinggi = 30 cm
Ditanya :
Luas = ... ?
Jawab :
L = x tinggi
= x 30 cm
= x 30 cm
= 45 x 30 cm
= 135 cm²
7. Diket :
d = 30 cm (r = 15 cm)
Ditanya :
Luas = ... ?
Jawab =
L = π x r x r
= 3,14 x 15 x 15 cm
= 706,5 cm²
8. Diket :
r = 49 cm (d = 98 cm)
Ditanya =
Keliling = ... ?
Jawab :
K = π x d
= x 98 cm
= 308 cm
9. Diket :
r = 70 cm
Ditanya :
Luas = ... ?
Jawab :
L = π x r x r
= x 70 x 70
= 15.400 cm²
Rumus setengah lingkaran :
Luas = x π x r²
Keliling = ( x π x d) + Diameter lingkaran