Answer:
A =10cm²
Step-by-step explanation:
According to the dimensions given we can basically tell that the area of the shaded region is half the area of entire rectangle so we can find the area in the following ways:
Area of a rectangle= a*b=(3+1)(5)=20cm²
Area of the shaded part= 20cm²/2=10cm²
Or
Area of a triangle half the rectangle=0.5a*b=0.5(5)(3+1)=10cm²
