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robert7248
28.06.2020 •
Mathematics
Use the formula to find the length of the base next to the goal given that the height of the trapezoid is 11ft and the base farthest from the goal is 28ft
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Ответ:
b1 = 22 ft
the length of the base next to the goal is 22 ft
Step-by-step explanation:
From the given formula;
Area A = 1/2×(b1 + b2)h ........1
Given;
Area A = 275ft^2
base b2 = 28 ft
base b1 = ?
height h = 11 ft
From equation 1;
Making b1 rhe subject of formula;
A = 1/2×(b1 + b2)h
Multiply through by 2;
2A = (b1+b2)h
b1+b2 = 2A/h
b1 = 2A/h - b2 ...... 2
Substituting the given values into equation 2;
b1 = 2(275)/11 - 28
b1 = 50 - 28
b1 = 22 ft
the length of the base next to the goal is 22 ft
Ответ:
50.27 cm²
Step-by-step explanation:
Subtract the area of the smaller circle from the area of the larger circle
The area of a circle = πr² ( r is the radius )
area = π × 5² - π × 3² = 25π - 9π = 16π ≈ 50.27 cm² ( nearest hundredth )