The oldest known type of arch is the
a. corbel arch
b. groin arch
c. round arch
d. none of the above

Corbel arch

Step-by-step explanation:

By oldest we mean the emergent of the arch since years.

Arches is a curved symmetrical structure spanning an opening and was first introduced by Romans in the first centuries.

Of all the options, the oldest known arch is the Corbel arch because the others were introduced after the introduction of Corbel arch.

Hence  (A) is the correct option.

1/8 3/16 3/4

step-by-step explanation:

you put them as all the same denominator and multiply

1

x = 1

step-by-step explanation:

0 ÷ x = 0

0 ÷ 1 = 0