Flashcard: 4a.1 - 4a.4

Front

If ∆ABC is equilateral, what is the measure of each angle?

Back

Each angle in an equilateral triangle measures 60°.

Front

What is the sum of the interior angles of a triangle?

Back

The sum of the interior angles of a triangle is 180°.

Front

In triangle BCD, if BC ≅ BD, what can be said about angles B and D?

Back

Angles B and D are congruent.

Front

If m∠B = 13x – 35 and m∠C = 5x – 19, how do you find the value of x?

Back

Set up the equation 13x - 35 + 5x - 19 + m∠D = 180° and solve for x.

Front

What is the measure of angle 2 if it is given as 50°?

Back

Angle 2 measures 50°.

Front

Solve for x: 13x - 35 = 180.

Back

x = 16.5.

Front

What is the measure of angle b if it is given as 36°?

Back

Angle b measures 36°.

Front

In triangle BCD, if m∠D = 2x + 14, how do you express m∠C in terms of x?

Back

m∠C = 180° - (13x - 35 + 2x + 14).

Front

What is the relationship between the angles in an isosceles triangle?

Back

In an isosceles triangle, the angles opposite the equal sides are congruent.

Front

If m∠C = 5x - 19, how do you find m∠C when x = 5?

Back

m∠C = 5(5) - 19 = 6°.