Question

construct ab of length 7.8cm. From this , cut off ac of length 4.7cm. Measure BC.​

Answer 1

Answer:

3.1 cm I think so but I'm not sure

Answer 2

With the help of a ruler and a compass, we can draw a line segment by following steps:

Given: Length of AB = 7.8 cm and length of AC = 4.7 cm.

Steps of construction:

Step 1: Construct a line l and mark a point A on it.

Step 2: Place zero mark of the ruler at A.

Step 3: Expand the compasses up to 7.8 cm and mark a point B at a distance of 7.8 cm from point A.

Hence, AB is the line segment of 7.8 cm

Step 4: Put the pointer of compasses at point A and mark another point C at a distance of 4.7 cm from A such that AC = 4.7 cm.

Step 5: Now, measure the length of points B and C.

We find that BC = 3.1 cm.