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Alisiya [41]
3 years ago
15

The base of a triangle is 21 inches and the height is 12 inches which of these expressions correctly shows how to calculate the

area of a triangle
a (21 x 12) divided by 2
b ( 21 + 12) x 2
c (21 + 12) divided by 2
d ( 21 x 12) x 2
Mathematics
1 answer:
I am Lyosha [343]3 years ago
5 0

½ x 21 x 12=126

So the answer is a

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fgiga [73]

Answer:

Option a 26 inches square

Step-by-step explanation:

Given in the picture is a triangle with 3 sides as 10.8 inches, 5 inches and base =10+3 = 13 inches

The altitude for base 13 inches is shown as 4 inches.

We know that for any triangle area

=1/2 * base * height

Here base = 13 and height = 4

Hence area = 1/2 (13)(4) = 26 inches square

Answer is option a

---

This can be done in another way also

There are two triangles one with base 10 inches and height 3 inches and another with base 3 inches and height 4 inches

Area of combined figure = sum of area of two triangles

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20+6

=26 square inches

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ser-zykov [4K]
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