B b
та
Diagram NOT
accurately drawn
7.4 cm
450
80°
4
D
5.8 cm
С
S
3lha
ABC is a triangle.
D is a point on AC.
Angle BAD = 45°
Angle ADB = 80°
AB = 7.4 cm
DC = 5.8 cm
ele
Work out the length of BC.
Give your answer correct to 3 significant figures.

The correct answer here is c

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)