# Choose the best word for the blank: If a quadrilateral with two pairs of consecutive congruent sides...

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Let ABC be an acute triangle with angle A = 60 and let D be the midpoint of BC. The points E and F are the feet of the altitudes from B and C respectively. Which one of the given descriptions best describe triangle DEF?

a) Right angled
b) Isoceles
c) Equilateral
d) Scalene

posted May 1
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