The area of a triangular board is 3 and 8 / 7 square decimeters, which is 15 / 17 of that of a rectangular board

The area of a triangular board is 3 and 8 / 7 square decimeters, which is 15 / 17 of that of a rectangular board

Rectangular area 3.7/8 △ 15 / 17
=31/8×17/15
=527/120
=4.47/120 square meters

The area of a trapezoidal board is 1.8 square meters, the upper bottom is 13 decimeters, the lower bottom is 17 decimeters, how high is it
If you saw the largest square on this board, what is the area of the square?

S=1/2(a+b)h => h=2S/(a+b)
∴h=2*1.8/(1.3+1.7)=3.6/3.0=1.2 m
The biggest square sawed is the one with the height as the side length, that is, the side length is 1.2m
The area is: s positive = 1.2 & # 178; = 1.44 M & # 178;

There is a rectangular board 3.5 meters long and 2.7 meters wide, with an area of several square decimeters
High wealth
Train test

35×27=945
The area is 945 square decimeters