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Blizzard [7]
3 years ago
11

A high school football pennant is in the shape of an isosceles triangle. The base is 18 inches long. The sides meet at an angle

of 40°. To the nearest tenth, what is the length of each side?
Mathematics
1 answer:
Oksanka [162]3 years ago
3 0

Answer:

The length of each side is 26.3 cm

Step-by-step explanation:

Opposite sides of an isoceles triangle are equal

The isoceles triangle is divided into 2 right-angled triangles so the length of one side can be calculated using trigonometric ratio

When the isoceles triangle is divided, the angle in the right-angled triangle is 20° (1/2 of 40°) and the base is 9cm (1/2 of 18 cm), the hypotenuse side is calculated using trigonometric ratio

Let the length of the hypotenuse side be y

9/y = sin 20°

y = 9/0.3420 = 26.3

Length of each side is 26.3 cm

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