How many 20 cm by 30 cm rectangular tiles would you need to tile the outdoor are shown below?
i calculated that the area of the shape is 10.95m squared, but the answer in the book (183 tiles) is different then the answer i got.
where did i go wrong?

The triangles are similar. what is the value of x? enter your answer in the box. x = two right triangles. the larger right triangle is labeled x on the longer leg, 12 on the shorter leg and 20 on the hypotenuse. the smaller triangle is labeled 4 on the longer leg, 3 on the shorter leg, and 5 on the hypotenuse.

Ineed in figuring out this problem.

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?