BC=2.64m, AC=2m, Angel C=65
By cosine rule,
AB=√2.642 + 22 - 2(2.5)(2) cos65
AB=2.6m
The measurement of AB is 2.5m but the answer can be acceptable because the rope was not fixed enough and the ground level is not flat.
By sine rule,
=
Angle B=44
The measurement of angle B is 45 but this answer can be acceptable because we used angle paper and the grass is so dense.
Angel A=180-(65+44)
=71
The measurement of angle A is 70 but this answer can be acceptable because we use angle protector and the grass is so dense.
The area by using sign rule,
A= x 2.64 x 2 x sine 65
A=2.4m2
Area, A= b h
A= x 2 x 2
A=2m2
We can accept the area of the triangle because of the calibration error when we measure the height of the triangle.
AC=3.85m, BC=2m,Angel C=40
AB=√3.852+22-2(3.85)(2) cos40
AB=2.6m
The measurement of AB is 2.5m but the answer can be acceptable because the rope was not fixed enough and the ground level is not flat.
By sine rule,
=
Angel A=29
The measurement of angle B is 30 but this answer can be acceptable because we used angle paper and the grass is so dense.
Angel B=180-(29+40)
B=111
The measurement of angle A is 110 but this answer can be acceptable because we use angle protector and the grass is so dense.
The area by using sign rule,
A= x 3.85 x 2 x sine 40
A=2.4m2
Area, A= b h
A= x 2 x 2
A=2m2
We can accept the area of the triangle because of the calibration error when we measure the height of the triangle.