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ololo11 [35]
3 years ago
9

If θ is an acute angle and sin θ = 2 1 , then cos θ =

Mathematics
1 answer:
ss7ja [257]3 years ago
3 0
First of all i think theres a mistakein the question;
i think it is sin θ = \frac{1}{2}

and then sin 30° = \frac{1}{2}

thus θ= 30°\frac{ \sqrt{3} }{2}
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Jamie is trying to work out the surface area of the cuboid below. Spot any mistakes and write the correct answer.
umka21 [38]

Step-by-step explanation:

The dimensions of the cuboid are 5 cm, 7 cm and 9 cm.

The formula for the surface area of the cuboid is as follows :

A=2(lb+bh+hl)

We have,

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So,

A=2(9\times 7+9\times 5+7\times 5)\\\\A=2\times 143\\\\A=286\ cm^2

Jamie forgets to multiply 143 by 2 as the formula for surface area contains 2 as well.

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notka56 [123]
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m_a_m_a [10]

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spayn [35]
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