The area of a triangle is 16 square centimeters. Its height is increased by three times, and its bottom remains unchanged. Its area becomes () square centimeters

Triangle area = bottom * height / 2
At present, the area has been tripled
So the new area is: 16x3 = 48

The area of a triangle is 15 square centimeters. How much is the area when the base height is increased to 3 times of the original

Triangle area = base x height / 2, base constant height expanded to 3 times the original, so it is 45 square centimeters

A rectangle 15 cm long and 9 cm wide is reduced by 1:3, and the area of the figure is______ Square centimeter

(15 / 3) × (9 / 3), = 5 × 3, = 15 (square centimeter); answer: the area of the figure is 15 square centimeter

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