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matthewmalte7329
25.07.2019 •
Mathematics
Triangle qrs, with vertices q(6, -2), r(4, -7), s(2, -5), is drawn inside a rectangle, . what is the area, in square units, of triangle qrs? !
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Ответ:
d = root ((x2-x1) ^ 2 + (y2-y1) ^ 2)
For QR:
QR = root ((4-6) ^ 2 + (-7 + 2) ^ 2)
QR = 5.385164807
For QS:
QS = root ((2-6) ^ 2 + (-5 + 2) ^ 2)
QS = 5
For RS:
RS = root ((2-4) ^ 2 + (-5 + 7) ^ 2)
RS = 2.828427125
Now we apply the heron formula:
A = root (s * (s-a) * (s-b) * (s-c))
Where,
s = (a + b + c) / 2
s = (5.385164807 + 5 + 2.828427125) / 2
s = 6.606795966
Substituting:
A = root (6.606795966 * (6.606795966-5.385164807) * (6.606795966-5) * (6.606795966-2.828427125))
A = 7.00000000
A = 7 units ^ 2
The area, in square units, of triangle QRS is:
A = 7 units ^ 2
Ответ:
The formula for finding volume of a cone = (π · r² · h) ÷ 3
r = 3
3² = 3 × 3 = 9
h = 7
7 × 3 × π = 21π
Your answer is C. 21π³
Hope this helps :)