What is the measure of angle EDF shown in the diagram below?
You can assume AB is the diameter of a semicircle, C is on the arc of the semicircle, and D, E, F are points of tangency between the inscribed circle I and the triangle ABC.
There are 10 squares that are constructed as shown in the diagram. Find the difference between blue and red angle in degrees.
As shown in the diagram below, circle D is internally tangent to circle A and externally tangent to circles B and C.
If circle B has a radius of 2 and C has a radius of 1, what is the radius of circle D?
According to the image below, what is the measure (in degrees) of angle ABC?
Three identical squares are shown in the diagram. If the area of the triangle is 1 square meter, what is the area of a single square?
A man has a rectangular garden 55x40m and he makes a 1m wide diagonal path as shown in the diagram. What is the area of the path?
