Answer:
81.64
Step-by-step explanation:
r=d÷2
=26÷2
=13
p= 2*22/7*13
=81.64
Answer:
66.8 cm
Step-by-step explanation:
to find the curved perimeter bit of the semicircle, find the circumference.
so diameter×pi
26×pi = 26pi = 8.68140899
multiply that by what fraction of the full circumference the semicircle is.
because it is semi, it is half, so 1/2 × 26pi
this gives 13pi which you add to the diameter to find the flat part of the semicircle.
13pi +26= 66.8407045cm
