Question

If a = 10 cm, R = 5 cm, then A =

Answer 1

Answer:

A = 2R

Step-by-step explanation:

Given ,

A = 10 cm

R = 5 cm

A in terms of R can be found as ,

A/R = 1

By substituting the values ,

10 / 5 = 1

2 / 1 = 1

2 = 1

This means that A is 2 times R or R = A/2

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Answer 2

Answer:

angle A = 90° = right angle

Step-by-step explanation:

given that:

a = 10 cm , R = 5 cm

from trigonometry , using sine formula:

a / sin A = b / sin B = c / sin C = 2R

a , b , c are sides and A , B , C are angles

R = radius

we have to find angle of A

substitute values a = 10 cm , R = 5 cm in [a / sin A = 2R ] formula:

10 cm / sin A = 2(5 cm)

10 cm / sin A = 10 cm)

sin A = 1

angle A = sin⁻¹(1)

A  = 90°

angle A = 90° = right angle