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Oksi-84 [34.3K]
3 years ago
7

Find the perimeter and area of length 3cm and width 5 cm

Mathematics
1 answer:
Anni [7]3 years ago
4 0
L = 5 and w = 3

Perimeter = 2(l + w)
P = 2(5 + 3)
P = 2(8)
P = 16 cm


Area = l*w
Area = 5*3
Area = 15 cm^2
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<u>Answer:</u>

Angle A = 39°

<u>Step-by-step explanation:</u>

We are given that there is a triangle ABC where a = 9, c = 5 and angle B = 120° and we are to find the measure of angle A.

But first we need to find the side b using the law of cosine:

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Now finding angle A using law of cosine:

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