780 handshakes.
(n(n-1))/2
(40(40-1))/2
(40*39)/2
1560/2
780
Answer:
Yes
Step-by-step explanation:
Yes, because there are two pairs of sides marked as congruent, seen by the line bisectors. And, angles T and S are marked as congruent.
Answer:
yes
Step-by-step explanation:
x is equal to - 2/3 after collecting like terms