Answer:
∠D = 180°- ∠A
∠D = 180° - (30+5x)
15+10x = 180° - 30-5x
15x = 180 - 30 - 15
15x= 135
x = 9
height = 140.875m
Step-by-step explanation:
Volume of first pyramid= base * height /3 = 230*147/3= 11270
if the base is 240, volume is remain -> height = volume *3 /base
= 11270*3/240 =140.875m
8x+5x+10+6=
13x+16 this is ur answer
