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#33489

triangle

congruence

geometry

hard

90 sec

Triangles $△ A BC$ and $△ D EF$ are similar. The measure of angle $A$ is $4 0^{\circ}$ , and the measure of angle $B$ is $6 0^{\circ}$ . If side $BC$ has a length of $10$ units, and side $EF$ has a length of $10$ units, what is the measure of angle $D$ in degrees?

• Up to 5 characters (6 if negative). Only numbers, decimal (.), fraction (/), negative (-).
• Fractions must be in lowest terms.
• Mixed numbers must be converted to improper fractions.