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Chose the missing side length and the trigonometric ratio you would use to calculate.

Chose the missing side length and the trigonometric ratio you would use to calculate-example-1
User JerH
by
8.2k points

1 Answer

3 votes

Answer:

The missing value is 2.9mm and cosine was used

Explanation:

Given triangle is a right-angled triangle we can use trigonometric ratios to calculate the missing length.

In the given triangle,

Base = k

Hypotenuse = 15mm

Angle = 79

We will use trigonometric ratio which includes base and hypotenuse.

Using cosine,


cos\ (angle) = (Base)/(hypotenuse)\\cos\ 79 = (k)/(15)\\k = cos\ 79 * 15\\k = 0.1908*15\\k = 2.862

Rounding off to nearest tenth


k= 2.9mm

Hence,

The missing value is 2.9mm and cosine was used

User TrueY
by
8.1k points

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