2174

Find the measure of the red angle.

2147

Prove the red angle is $45^\circ$.

2016

Find all angles.

1756

The blue points are the midpoints of the sides of the yellow triangle. The green triangles are equilateral. Find the measure of the red angle.

1386

Find the measure of the red angle.

1213

Prove the red triangles are congruent.

1175

Prove the red lines are perpendicular.

1154

Prove $\text{green area}:\text{red area} = 1:3$.

1036

Prove the red line segment is congruent to a side of the green equilateral triangle.

779

Prove the red line segments are congruent.

552

Prove the length of the green polyline is approximately $3.142$.