Question

Bantu nmr 3,4 y.. thanks...

Answer 1

3. Lp = 2 (p.l + p.t + l.t)
900 = 2 (15.10 + 15.t + 10.t) kedua sisi dibagi 2
450 = 150 + 15t+10t
25t = 450-150
25t = 300
t = 300/25
t = 12 cm

Volume = p.l.t = 15.10.12 = 1800 cm³

4. Luas sisi tegak = Keliling x tinggi
3000 = K x 25
K = 3000/25
K = 120 cm

K = 6s = 120 cm
s = 120/6
s = 20 cm

Luas alas = 1/2 x 3√3 x s² = 1/2 x 3√3 x 20² = 600√3 cm²
Volume - L alas x tinggi = 600√3 x 25 = 15000√3 cm³