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rumus persegi panjang L = p x l
7.812 m² = p x 63 m
p = 7.812 m² : 63 m
p = 124 m
jawabannya b
No.25
Volume prisma = (1/2 x alas x tinggi segitiga) x tinggi prisma
V = (1/2 x 8 cm x 7 cm) x 14 cm
V = 28 cm x 14 cm
V = 392 cm³
jawabannya c
No.26
Luas = panjang x lebar
L = 85 cm x 62,5 cm
L = 5312,5 cm²
jawabannya d
No.27
Luas lingkaran = π.r²
346,5 cm² = 22/7 x r²
r² = 346,5 : 22/7
r² = 110,25
r = √110,25
r = 10,5
jawabannya b
No.28
Volume prisma = alas x tinggi
630 cm³ = a x 21 cm
a = 630 cm³ : 21 cm
a = 30 cm²
jawabannya b
No.29
Luas segitiga = 1/2 x alas x tinggi
900 cm² = 1/2 x a x 24 cm
900 cm² = a x 12 cm
a = 900 cm² : 12 cm
a = 75 cm
jawabannya c
No.30
Volume tabung = π.r².t
9.891 cm³ = 22/7 x r² x 14 cm
9.891 cm³ = r² x 44 cm
r = √9.891 cm³ : 44 cm
r = √225 cm
r = 15 cm
jawabannya b
Semangat belajar.. ^_^