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igivehead666
22.08.2019 •
Mathematics
Height of a triangle with base 5m and area 20m2
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Ответ:
Start with the formula for the area of a triangle
Plug in , , and
Multiply both sides by 2
Distribute
Subtract 36 from both sides
Factor the right side (note: if you need help with factoring, check out this solver)
Now set each factor equal to zero:
or
or Now solve for x in each case
So our possible answers are
or
However, since a negative height doesn't make sense, our only solution is
So the height is 9 m
Now subtract 5 from the height to get the base
So the base is 4 m
Check:
Start with the formula for the area of a triangle
Plug in , , and
Multiply
Divide. Since the two sides of the equation are equal, this verifies our answer.
Ответ:
A=1/2bh
Then, plug in your known numbers
20m2=1/2h(5m)
What I do next, is I work backwards by dividing the are by 1/2, which equals 40. All that is left to do, is divide this number, 40, by 5 to find the height.
40/5=8
Therefore, the height of the triangle is 8m
Ответ: