1. ABCD is a trapezoid with midsegment EF. If AB = 12 and CD = 24, what is the length of EF?
 2. ABCD is a trapezoid with midsegment EF. If AB = 21 and CD = 35, what is the length of EF?
 3. ABCD is a trapezoid with midsegment EF. If AB = 7 and EF = 9, what is the length of CD?
 4. ABCD is a trapezoid with midsegment EF. If CD = 32 and EF = 22, what is the length of AB?
 5. The length of the midsegment of a trapezoid is the _____ of the length of the two bases.
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