4. The sides of a triangle are in the ratio 2: 4:5.
If the second side is 56 cm, What is the perimeter of the triangle?

Step-by-step explanation:

Ratio: 2:4:5

Sides are : 2x , 4x , 5x

Second side = 56 cm

4x = 56

x= 56/4

x = 14

2x = 2*14 = 28 cm

4x = 4*14 =  56 cm

5x = 5*14 = 70 cm

Perimeter = 28 + 56 + 70 = 154 cm

solution:

we have to construct

∠m nt ≅ ∠p qr

the steps to draw this construction are

step 1: use a compass to draw an arc from point q which intersects the side pq at point a and the side qr at point b.

step 2: draw a segment nt and use the same width of the compass to draw an arc from point n which intersects the segment nt at a point x.

step 3:

step 4: join points n and y using a straightedge.

step 3:

option (d).maintaining the same width of the compass as ab, draw an arc from point x such that it intersects the arc drawn from n in a point y.

to draw   congruent angles , 1. width of compasses while drawing two angles should be same i.e from point at which angle has to be drawn, 2.the distance between the two points where the compass intersects the two sides should be same while drawing any two congruent angles.

step-by-step explanation:

points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.