1. a. AABC has a right angle at B, BC = 4, and has an area of 10 square units. What is the

length of AB?

Step-by-step explanation:

A right angled triangle is a triangle that has one of this angles to be 90°. According to the ΔABC, the angle at B is 90°.

Area of a triangle = 1/2 * base * height

According to the diagram shown, the base is BC and the height is AB which is the required side.

Area of the triangle = 1/2 * BC * AB

Given area of the triangle = 10 square units

BC = 4 units

AB is the required length.

Substituting this values into the formula above;

10 = 1/2 * 4 * AB

10 = 2AB

Dividing both sides by 2

2AB/2 = 10/2

AB = 5 units

Hence the length of AB is 5 units.

10000

step-by-step explanation: divide by 2,

step-by-step explanation:

hans did not square the 40-unit side; he merely multiplied it by 2.   incorrect.