The area of a triangle is 2.04 square decimeters. Its bottom is 3.4 decimeters. What's the height of the bottom

The area of a triangle is 2.04 square decimeters. Its bottom is 3.4 decimeters. What's the height of the bottom

The height is 2.04 × 2 △ 3.4 = 1.2 decimeters

3.8 decimeters × 4 decimeters = how much (calculate triangle area)

15.2 square decimeters

A cuboid board is sawed into four equal pieces, with a surface area of 1200 square centimeters. Its cross-sectional area is () square centimeters

When sawing four equal pieces, it needs to be sawed three times, adding two cross sections each time, then the total number of cross sections is increased by six, and the surface area is increased by 1200 square cm, then the cross-sectional area is (1200 / 6 = 200) square cm