First one is 2 ft because 12 inches in one foot. Other people will probably help out on rest!! I’m little busy rn so :D
In order to find the surface area of a rectangle:
-- Find or measure the length of the rectangle.
-- Find or measure the width of the rectangle.
-- Make sure both quantities are in the same units.
If they're not, then convert one or the other so that they are.
-- Multiply the two numbers.
The product is the area of the rectangle, in units of
square-(the unit in which the dimensions are measured).
Answer:
1,3,4,5,6,10,11,14,16,17,18,20
Step-by-step explanation:
I've been there so many times. Hope you have a great day!
Answer:
Step-by-step explanation:
a= 12 mm ; b = 16 mm ; c = 18 mm
s = (a + b+c)/2
![=\dfrac{12 + 16 + 8}{2}\\\\= \dfrac{36}{2}\\\\= 18\\\\](https://tex.z-dn.net/?f=%3D%5Cdfrac%7B12%20%2B%2016%20%2B%208%7D%7B2%7D%5C%5C%5C%5C%3D%20%5Cdfrac%7B36%7D%7B2%7D%5C%5C%5C%5C%3D%2018%5C%5C%5C%5C)
s -a = 18 - 12 = 6 mm
s -b = 18 - 16 = 2 mm
s -c = 18 - 8 = 10 mm
![area = \sqrt{s(s -a)(s-b)(s-c)}](https://tex.z-dn.net/?f=area%20%3D%20%5Csqrt%7Bs%28s%20-a%29%28s-b%29%28s-c%29%7D)
![= \sqrt{18*6*2*10}\\\\= \sqrt{2160 }\\\\=46.47\\\\=46 \ mm^{2}\\](https://tex.z-dn.net/?f=%3D%20%5Csqrt%7B18%2A6%2A2%2A10%7D%5C%5C%5C%5C%3D%20%5Csqrt%7B2160%20%7D%5C%5C%5C%5C%3D46.47%5C%5C%5C%5C%3D46%20%5C%20mm%5E%7B2%7D%5C%5C)
![\dfrac{1}{2}* \ base * \ height = 46\\\\\dfrac{1}{2}*16* \ height = 46\\\\height = \dfrac{46*2}{16}\\\\](https://tex.z-dn.net/?f=%5Cdfrac%7B1%7D%7B2%7D%2A%20%5C%20base%20%2A%20%5C%20height%20%3D%2046%5C%5C%5C%5C%5Cdfrac%7B1%7D%7B2%7D%2A16%2A%20%5C%20height%20%3D%2046%5C%5C%5C%5Cheight%20%3D%20%5Cdfrac%7B46%2A2%7D%7B16%7D%5C%5C%5C%5C)
= 5.75
Height = 5.8 mm