Question

Jawab dengan benar!!!!

Answer 1

9. v kubus = 27000 cm³

r³ = 27000

r = 90cm

perbandingan sisi siku-siku = 2:1

L siku-siku = ½ x r x ½ r

= ½ x 90 x 45 = 2025 cm²

L sama kaki = 2025 cm²

alas = r = 90 cm

maka ½ x r x t = 2025

½ x 90 x t = 2025

t = 45 cm

panjang sisi miring :

p² = 45² + 45² = 45√2 cm

10. L = s x s = s² = 64 m²

s = √64 = 8m

FG² = FD² + DG²

= 4² + 4² = 4√2 m

FH = ½ FG = 2√2 m

HB = BD - DH

DH² = FD² - FH² = 4² - (2√2)²

= 16 - 8 = 8

DH = √8 = 2√2 m

BD² =AD² + AB² = 8² + 8² = 2 x 8²

BD = 8√2 m

HB = 8√2 - 2√2 = 6√2 m

FE = FG = 4√2 m

L trapesium = ½ x (HB +FE)xFH

= ½(6√2 + 4√2) x 2√2

= 5√2 x 2√2 = 10√4 = 20 m²