# Find Angle A Only For Maths Buffs

Discussion in 'Online Games & Puzzles' started by Thyagarajan, Apr 15, 2023.

1. ### ThyagarajanFinest Post Winner

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FIND
ANGLE A

(ONLY FOR MATHS BUFFS)

FINDING ANGLE A IS EASY!
Could you pl try?

Tagging @hrastro

Last edited: Apr 15, 2023

2. ### gamma50gGold IL'ite

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33.69 degrees?

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3. ### ThyagarajanFinest Post Winner

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Thanks for putting your ans in Spoiler. Could you pl put your working in spoiler?
Regards. God Bless

4. ### gamma50gGold IL'ite

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Sorry the correct ans should be 35.07 degrees. This is because sin 45 =1/2. So a perpendicular line drawn from angle B to the base is 4. Now sin A is 4/7. So sin inverse would be 35.07 degrees.

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.
8cos45° + 7cos A° = 10

7Cos A° = 10 - 8 Cos 45°

Cos A° = 1/7 of [10 - 8 x 0.7071]

= 1/7 of [10 - 5.656]

= 1/7 of (4. 35)

A° = cos inverse of 0. 621428

= 51.58°

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