Step-by-step explanation:
1.Volume of a pyramid
formula:V=1/3b²h or V=b²h/3
given:
base=13m
height=20m
V=1/3(13)²(20)
V=1/3(169)(20)
V=1/3(3380)
V=1126.666 or 1127m²
2.volume of a rectangle
V=lwh
V=(2.85)(2.15)(0.4)
V=2.451(19)
V=46.569dm²
3.volume of a cylinder
V=πr²h
radius=10cm
height=11cm
V=3.14(10)²(11)
V=3.14(100)(11)
V=3.14(1100)
V=3454cm²
4.Volume of a cone
V=1/3πr²h
Radius=4.2cm
height=9cm
V=1/3(4.2)²(9)
V=1/3(17.64)(9)
V=1/3(158.76)
V=52.92cm²
5.volume a rectangle
length is=17
height=8.5
width=12
V=lwh
V=(17)(8.5)(12)
V=1734cm²
