R=5
r(r-1)=30
r²+r=30
5²+5=30
5²=30-5
5²=25
5=5
Black box = r x 2
5 x 2 = 10
Black part of card is 10 sq cm.
-1/7 is the answer i thibk
Answer:
find from the Google
Step-by-step explanation:
find from the Google
Answer:
First try getting the formula for all the shapes and from then on just plug it in.
Step-by-step explanation:
Hope that helps :/
Answer:
Step-by-step explanation: a is complementary b is 52° c is the same as a d is 142°