Question

In triangle ABC, BC=AB and Angle B=80°. Then Angle A is equal to:
a) 80°
b) 40°
c) 50°
d) 100°​

Answer 1

Answer:

50°

Step-by-step explanation:

angleB+ angleA+ angleC= 180°. .... angle sum property of triangles

angleB = 80°. .... given

angleA= angleC..... equal angles of isosceles triangle

therefore, 80°+ 2( angle A) = 180°

angleA= (180-80)/2

= 50°

Answer 2

Answer:

The correct answer is Option(c) 50°

Step-by-step explanation:

Given: In triangle ABC, BC=AB and Angle B=80°.

To find: Then Angle A is equal to what?

Calculation:

Given, in

ΔABC, BC = AB and ∠B=80°

⇒∠C=∠A

[angles opposite to equal sides of a triangle are equal]

As we know that sum of all angles of triangle is = 180°

∠A+∠B+∠C=180°

⇒∠A+80°+∠A=180°

⇒2∠A=100°⇒

∠A= $\frac{100}{2}$

∴∠$A=50$°

• Angle: a corner whether constituting a projecting part or a partially enclosed space. : the figure formed by two lines extending from the same point. : a measure of an angle or of the amount of turning necessary to bring one line or plane into coincidence with or parallel to another. angled.
• Triangles are three-sided polygons with three vertices. The angles of the triangle are formed by connecting the three sides end to end at a point. The total of the triangle's three angles equals 180 degrees.

Find more like this here:

https://brainly.in/question/54231692

#SPJ3