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3 years ago

Help i will not pass if i get wrong

Mathematics

2 answers:

Oksana_A [137]3 years ago

4 0

Answer:

Hello! answer: 28.26

Step-by-step explanation:

You find circumfrence by doing diameter × pi or

radius × 2 × pi since we have are diameter this shall be a breeze 9 × 3.14 = 28.26 therefore the circumfrence is 28.26 hope that helps!

Lynna [10]3 years ago

4 0

Answer:

28.26 in.

Step-by-step explanation:

9 x 3.14

= 28.26

I could be wrong but I don't think so

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3 years ago

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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:

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

b - base

h - height

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:

$5^2+h^2=20^2$

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$h^2=375\to h=\sqrt{375}\\\\h=\sqrt{(25)(15)}\\\\h=\sqrt{25}\cdot\sqrt{15}\\\\h=5\sqrt{15}\ cm$

Calculate the area:

$A_\triangle=\dfrac{(10)(5\sqrt{15})}{2}=\dfrac{50\sqrt{15}}{2}=25\sqrt{15}\ cm^2$

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Step-by-step explanation:

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Step-by-step explanation:

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2 years ago