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2 years ago

Evaluate cos 7pi/8 without a calculator

Mathematics

2 answers:

NISA [10]2 years ago

8 0

Hey there!

7π/8

= 7(3.141593)/8

= 2.748894

3.141593 ≈ 3.14

= 7(3.14)/8

= 21.98/8

= 21.98 ÷ 8

= 2.7475

Answer: 2.748894 WHICH IS APPROXIMATELY 2.7475

Good luck on your assignment and enjoy your day!

~Amphitrite1040:)

Olin [163]2 years ago

4 0

Answer: Long answer- 2.748893572

Short answer- 2.7475

Step-by-step explanation:

Long Answer:

7(3.141592654)/8

Step 1: 7 x 3.141592654= 21.99114858

Step 2: 21.99114858/8= 2.748893572

Short Answer: 7(3.14)/8

Step 1: 7x3.14= 21.98

Step 2: 21.98/8= 2.7475

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Answer:

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Step-by-step explanation:

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We can tell that the total shape seems like two rectangles glued together. We can separate the left rectangle and determine the area of it and then determine the area of the right rectangle and combine them. Lets first solve the left rectangle.

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Step 2: Determine the area of the right rectangle

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Answer: $A_{total} = 14\ in^2$

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