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4 years ago

Calculate the area of each triangle using two different methods

Mathematics

1 answer:

timurjin [86]4 years ago

4 0

The area of a triangle is 1/2 bh
so to find the area of the larger triangle do the following calculation:
1/2 time 12 time 7. that will give you 42 ft squared. that is the larger triangle.
the next way to find the area i will show you is:

pretend that the the triangle is inside of a rectangle. now you have 4 triangles. you know that the base of the rectangle is 15 ft anf the height is 7. now take the smaller triangle and it has its rectangle base 3 and height 7. multiply to get 21 feet squared. divide by 2 since there are 2 triangles in the small rectangle. 10.5 feet squared

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3 years ago

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3 years ago

What is the surface area of the solid figure represented by the net?

Ivenika [448]

Answer:

Option B. 373.80 square centimeters

Step-by-step explanation:

see the attached figure to better understand the problem

we know that

The surface area of the figure is equal to the area of its 5 faces (3 rectangular faces plus 2 triangular faces)

step 1

Find the area of its 3 rectangular faces

$A_1=(5.6)(9.4)=52.64\ cm^2$

$A_2=(12.7)(9.4)=119.38\ cm^2$

$A_3=(13.9)(9.4)=130.66\ cm^2$

step 2

Find the area of its 2 triangular faces

$A_4=\frac{1}{2}(12.7)(5.6)=35.56\ cm^2$

$A_5=\frac{1}{2}(12.7)(5.6)=35.56\ cm^2$

step 3

Find out the surface area

$SA=A_1+A_2+A_3+A_4+A_5$

substitute the values

$SA=52.64+119.38+130.66+35.56+35.56$

$SA=373.80\ cm^2$

6 0

3 years ago

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scoundrel [369]

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3 years ago

Two old rsm students were standing twenty feet apart when they spotted mrs. rifkin. if they immediately run in opposite directio

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3 0

4 years ago

Read 2 more answers