11. (a) a radius 10.00
(bla diameter 17.5cm
2. Find the area in hectares of a rectangular piece of land
1.25km by 0.75km.​

Step-by-step explanation:

1.25 km × 0.75 km = 0.9375 km²

1 km = 100 hectares

0.9375 km² = 93.75 hectares²

131.25

Step-by-step explanation:

25r²-10r+10r-4=0

25r²-4=0 (Since -10 and 10 cancel each other out)

25r²=4

Divide both sides by 4 to get r² = 6.25

Square both sides to get r = 2.5

Plug 2.5 back into the equation to get the answer of 131.25