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Maths-

General

Easy

Question

$text Find m end text straight angle A text . end text$

hint Hint:

the base angle theorem states that if the sides of a triangle are congruent then the angles opposite these sides are congruent.

The correct answer is: straight angle A equals 150 to the power of ring operator

We have been given in the question diagram of a triangle named ABC where ∠ABC=60.

We have to find out angle A.

Step 1 of 1:
We have a given figure

In this figure,
$3 x equals 7 x minus 20$
4x = 20
x = 5⁰
So,
$straight angle B equals 3 x$
= 15⁰
And
$straight angle C equals 7 x minus 20$
7(5) - 20
= 15⁰
Now, we know that the sum of angle of triangle is 180⁰.
So,
$straight angle A plus straight angle B plus straight angle C equals 180 to the power of ring operator$
$straight angle A plus 15 to the power of 0 plus 15 to the power of 0 equals 180 to the power of ring operator$
$straight angle A plus 30 to the power of 0 equals 180 to the power of ring operator$
$straight angle A equals 150 to the power of ring operator$

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