The formula is a= 1/2bxh so 1/2(4)x8= 2x8=16 so the area is 16

You multiply the base and height. Then divide the answer by 2.

(bh)/2 or 1/2(bh)

so it would be 8*4 = 32 then ÷ 2 = 16

(bh)/2 or 1/2(bh)

so it would be 8*4 = 32 then ÷ 2 = 16

See my comments to Maria Not Telling's answer. You won't remember the formula unless you understand why it works, so I explain it. Use bits of paper, if it's easier to visualize what we're doing.