Use given triangle to fill in the blank.

Ashopper bought a watermelon a pack of napkins and some paper plates in his state there was no tax on food the tax rate on non-food items is 5% the total for the three items he bought was 825 before tags and he paid $0.19 in taxes how much did the watermelon cost

Find the area of the regular hexagon if a side is 20 cm.

Which geometric principle is used to justify the construction below?