At the entrance of the experimental primary school, there is a triangle warning sign with the bottom edge of 0.5 meters long and 0.7 meters high Paint, 0.85 kg per square meter. How many kg of paint do you need?

At the entrance of the experimental primary school, there is a triangle warning sign with the bottom edge of 0.5 meters long and 0.7 meters high Paint, 0.85 kg per square meter. How many kg of paint do you need?

Triangle area: 0.35/2 = 0.175 (M2)
Because it is two sides, so: 0.175 * 2 = 0.35 (M2)
0.35 * 0.85 = 0.2975 (kg)
So a total of 0.2975 kg of paint is needed

If you want to paint one side of a triangle road sign warning sign with a bottom edge of 1.5 meters long and a height of 1.2 meters, you need to use 0.8 kg of paint per square meter. How many kg of paint do you need to brush such 100 warning signs?

1.5*1.2÷2*0.8*100

There is a triangle traffic warning sign. Its bottom is 8dm, and its specific height is 0.1M. Excuse me, what is the area of this traffic warning sign?

0.1 M = 1 decimeter
The area of this traffic sign
=8×（8-1）÷2
=8×7÷2
=28 (square decimeter)