A bedroom door has an area of 21 square feet. Its perimeter is 20 feet. What are the dimensions of the door?

Atriangle has a side lengths of 18cm, 80 cm and 81cm. classify it as acute obtuse or right?

Plz hurry evaluate the expression a+b where a=8 and b=19

Plz ! define the type of sequence below. -2,0,2,4,6 a. both arithmetic and geometric b. arithmetic c. neither arithmetic nor geometric d. geometric