En 403 5.0 cm
(b)
The pie chart shows the
distribution of textbooks to six classes A.
B, C, D, E and F in a school.
3
A
B
F
6050
70°
rs are
80
72-
Nor DRAWN TO SCALE
ven
(1) If Class D was given 720 textbooks,
how many textbooks were distributed to
each of the remaining classes?
Fin​

Okay so for every triangle has three angles that always add up to 180 degrees. and to tell the difference between whether they are secure, right or obtuse is that acute: has one angle that is less than 90 degrees. right triangle means there is at least one angle that is exactly 90 degrees. and an obtuse angle has an angle that is bigger than 180 degrees. i’ll do #13 as an example: 13. 40 and 50 so if every triangle has 180 degrees 40+50= 90 degrees then180-90= 90 degrees so the third angle is 90 degrees and because this triangle has a 90 degree angle it means it is a right triangle

You need to show me the graphs so that i can choose one