If you mean area, then, the area of a rectangle is width * height. So...50cm^2.
5 x 10 = 50cm2
30cm
You question is does not make sense. The base is a straight line , NOT an area. You either want the Area of the rectangle or the Length of the base. The Area of a rectangle is found by multiplying the base (length) to the width(height). A = lW (or BH) Algebraically rearrange to find the base length B = A/H ( That is area divided by height).
5cm * 5cm * 10cm = 250 cm3
a triangle?
V = 10cm * 6cm * 5cm = 300cm3
250 cm3
Rectangles have area. 50 square cm in this case.
A dog can be
Oh, what a lovely question! Let's imagine that rectangle together. To find the dimensions, we can think of different combinations that multiply to give us 5cm², like 1cm by 5cm or 0.5cm by 10cm. Remember, there's no mistakes in art, just happy little accidents!
10cm
work out the tatio