tolong bantu yahhhh dengan caranya, ini buat besokk. please

38.
Volume limas = 1/3 x ( luas alas ) x tinggi
Volume limas = 1/3 x (1/2x12x16) x 18
= 1/3 x 96 x 18
= 1/3 x 1.728
= 576 cm*3
Jawaban = a. 576 cm*3

39.

Volume limas = 1/3 (luas alas ) x tinggi
180 = 1/3 x s*2 x 15
180 = 5s*2
180/5 = s*2
36 = s*2
√36 = s
6 = s
Jawaban = c. 6 cm

40.
misal
Tinggi Limas = x

x*2 = 15*2 - 9*2
x*2 = 225 - 81
x*2 = 144
x = √144
x = 12

Volume limas = 1/3 x luas alas x tinggi
= 1/3 x x 10 x 18 x 12
= 720cm*3
Jawaban = a. 720 cm*3