Answer:
Step-by-step explanation:
First Problem - it is an equilateral triangle as three sides are of same length
The interior angles of an equilateral triangle is 60 deg.
So 7x - 3 = 60
7x = 63
x = 9 deg.
Second Problem - again it is an equilateral triangle as three interior angles are equal.
So the three sides are of same length -
6x - 3 = 5x
x = 3
Third Problem - it is an isosceles triangle as the base angles are equal.
So the two sides are of same length -
x + 4 = 3x - 8
2x = 12
x = 6
Fourth Problem - it is an isosceles triangle as the base angles are equal.
So the two sides are of same length -
2x + 7 = 4x - 7
2x = 14
x = 7
BC = 4x = 28
Fourth Problem - it is an isosceles triangle as the two sides are of same length.
The base angles are equal at 73 deg.
Sum of interior angles for a triangle = 180 deg.
So 73 + 73 + 6x + 4 = 180
150 + 6x = 180
6x = 30
x = 5
