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german
3 years ago
10

abel drew some triangles.his drawing had 21 vertices. how many triangles did he draw?write a division equation to answer the que

stion.
Mathematics
1 answer:
Vilka [71]3 years ago
3 0
Triangles have 3 vertices. The total is 21 vertices. 21 / 3 = 7. He drew 7 triangles.
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Step-by-step explanation:

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an isosceles triangle has congruent sides of 20cm. the base is 10cm. find the height of the triangle.​
dolphi86 [110]

Answer:

\large\boxed{A_\triangle=25\sqrt{15}\ cm^2}

Step-by-step explanation:

Look at the picture.

The formula of an area of a triangle:

A_\triangle=\dfrac{bh}{2}

<em>b</em><em> - base</em>

<em>h</em><em> - height</em>

<em />

We need a length of a height.

Use the Pythagorean theorem:

leg^2+leg^2=hypotenuse^2

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leg=5,\ leg=h,\ hypotenuse=20

Substitute:

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3 years ago
No
zhuklara [117]
It’s B 20 students I am sure that’s correct
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