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Maurinko [17]
4 years ago
14

Isosceles triangle ABC has a perimeter of 96 centimeters. The base of the triangle is and measures 24 centimeters.

Mathematics
2 answers:
tankabanditka [31]4 years ago
4 0
AB + BC + AC = 96
but AB = AC  [isosceles triangle]
2AB + 24 = 96
2AB = 96 - 24 = 72
AB = 72/2 = 36
AB = 36 degrees.
Vedmedyk [2.9K]4 years ago
4 0

Isosceles triangles are triangle with 2 equal sides.

base of the triangle is AC , therefore sides AB and BC are equal

perimeter is sum of all the sides of ABC

formula is

AB + BC + AC = 96 cm

AC = 24 cm

then

AB + BC = 96 - 24

AB + BC = 72 cm

since its an isosceles triangle

AB = BC = x

then

x + x = 72

2x = 72

x = 72/2 = 36 cm

measure of AB = 36 cm

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Part 5.1.1:

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Part 5.1.2:

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We are given that:

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Part 5.1.1

Recall that:

\displaystyle \sin^2 \theta + \cos^2 \theta = 1

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Recall that:

\displaystyle \begin{aligned}  \cos 2\theta &= \cos^2 \theta - \sin^2 \theta \\ &=   1- 2\sin^2\theta \\ &= 2\cos^2\theta - 1\end{aligned}

We can use the third form. Substitute:

\displaystyle \left(\frac{7}{8}\right) = 2\cos^2 A - 1

Solve for cosine:

\displaystyle \begin{aligned} \frac{15}{8} &= 2\cos^2 A\\ \\ \cos^2 A &= \frac{15}{16} \\ \\ \cos A& = \pm\sqrt{\frac{15}{16}} \\ \\ \Rightarrow \cos A &= \frac{\sqrt{15}}{4}\end{aligned}

In conclusion:

\displaystyle \cos A = \frac{\sqrt{15}}{4}

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