Shade two more squares so that this grid has rotational syminetry of order 4.

1) bottom row, next to the last (4th square going across)

2) second row, first square (1st column, next to the bottom)

Step-by-step explanation:

1) bottom row, next to the last (4th square going across)

2) second row, first square (1st column, next to the bottom)

a

step-by-step explanation:

rurbrbrjrnrbjr

34.5 cm

step-by-step explanation:

generally for a circular segment of angle, θ° and radius r

arc length

= (θ/360) x circumference

= (θ/360) x 2πr

in our case, θ = 60°, π=3.142 and r = 33 cm

substitute into above formula

arc length

= (60/360) x 2(3.142)( 33) = 34.5 cm