Answer: 
Step-by-step explanation:
Given
The length of the rectangular prism is
width of the rectangular prism is 
height of the rectangular prism is 
The surface area of the rectangular prism is ![2[wl+lh+hw]](https://tex.z-dn.net/?f=2%5Bwl%2Blh%2Bhw%5D)
Put the values
![\Rightarrow 2[8\times 12+15\times 12+15\times 8]\\\Rightarrow 2[96+180+120]=2\times 396\\\Rightarrow 792\ m^2](https://tex.z-dn.net/?f=%5CRightarrow%202%5B8%5Ctimes%2012%2B15%5Ctimes%2012%2B15%5Ctimes%208%5D%5C%5C%5CRightarrow%202%5B96%2B180%2B120%5D%3D2%5Ctimes%20396%5C%5C%5CRightarrow%20792%5C%20m%5E2)
The surface area of the rectangular prism is 
Answer:
7a+28b=21
Step-by-step explanation:
7×a=7a
7×-3= -21
7×+4b=+28b
so....
7a-21+28b=0
7a+28b=21
Answer:
Step-by-step explanation:
Perpendicular height will split the base into two equal parts.
Use Pythagorean theorem,
hypotenuse² = base² + altitude²
= 28² + 45²
= 784 + 2025
= 2809
hypotenuse = √2809 = √53 * 53 = 53 mm
Perimeter = 53 + 53 + 56 = 162mm
Answer:
1) look at the picture
2) look at the picture
3) look at the picture
4) look at the picture
Step-by-step explanation: Hope this help :D
Step-by-step explanation:
πr^2h
22/7*1*1*8
22/7*8
176/7