Question

In the diagram, what is AC?


6



12.33



10



12

Answer 1

you can use Pythagorean theory on this one a^2+b^2+c^2
so
first you need to find DB
a^2+8^2=17^2
a^2=225
a=15
next you need AD which can be found by subtracting DB from AB
so 21-15=6 AB=6
then we use Pythagorean again this time on the smaller triangle
6^2+8^2=c^2 c^2 is AC
36+64=c^2
100=c^2
10=c
AC=10