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yuradex [85]
3 years ago
7

A blanket is 3 feet its perimeter is 16 what is its area

Mathematics
2 answers:
Bumek [7]3 years ago
5 0
The area is 48. Because you have to multiply 3 times 16 because to find the area you need to multiply two numbers because it is a 2 dimensional figure. So the answer is 48.
tresset_1 [31]3 years ago
5 0
A blanket is rectangular in shape, so its perimeter=2(l+b)
16=2*3+2*l
2L=16-6=10
L=10/2= 5
Area=l*b=3*5=15feet
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3 0
3 years ago
Find the value of b. Round your answer to the nearest tenth.
marissa [1.9K]

Answer:

Side CA = 7.8

Step-by-step explanation:

<u>Given:</u>

Acute angled \triangle ABC.

\angle B =40^\circ

AB = 10

BC = 12

We can use cosine rule here to find the side AC = b

<em>Formula for cosine rule: </em>

cos B = \dfrac{a^{2}+c^{2}-b^{2}}{2ac}

Where  

a is the side opposite to \angle A

b is the side opposite to \angle B

c is the side opposite to \angle C

cos 40 = \dfrac{12^{2}+10^{2}-b^{2}}{2\times 12\times 10}\\\Rightarrow cos 40 = \dfrac{144+100-b^{2}}{240}\\\Rightarrow 0.77 = \dfrac{244-b^{2}}{240}\\\Rightarrow 244-b^{2} = 0.77 \times 240\\\Rightarrow 244-b^{2} = 183.85\\\Rightarrow 244-183.85 = b^{2}\\\Rightarrow b^2 = 60.15\\\Rightarrow b = 7.76

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