2224

Prove the red line segments are congruent.

2174

Find the measure of the red angle.

2167

Prove red line bisects the blue side of the triangle.

2162

The blue angles differ by $60^\circ$. The green angles differ by $60^\circ$. The yellow angles differ by $60^\circ$. Prove the red triangle is equilateral.

2110

Each base angle is half the angle opposite it. Prove the red angle is $60^\circ$.

2016

Find all angles.

1965

Prove the sum of the green line segments is double the red line segment.

1948

Prove $\dfrac{3}{a+b+c} = \dfrac{1}{a+c} + \dfrac{1}{b+c}$.

1930

Find the measures of the angles of the yellow triangle.

1898

Find the angles of the yellow triangle.

1833

Prove the red angle measures $60^\circ$ iff the blue circles and line are concurrent.

1656

Prove the red triangle is equilateral.

1550

Prove the red line bisects the blue line.

1510

Find the measure of the red angle.

1305

Find the measure of the red angle.

1211

The blue triangles are equilateral. Find the measure of the red angle.

1208

Prove the red angle is $60^\circ$ iff the red line segments are congruent.

1196

The blue points are midpoints of sides of the yellow triangle. Prove the red line segments are congruent.

1187

The black triangle is equilateral. Prove the red angle measures $60^\circ$.

1175

Prove the red lines are perpendicular.