Mensuration class 8 Chapter 11 important questions and formulas are mentioned here. Got through the formulas and practice the concept of mensuration with the help of given examples. This chapter 11 of Class 8 (Mensuration) is an important topic of CBSE board. Learning this topic – Mensuration will help students in scoring good marks in exams.
Mensuration Class 8 Extra Questions
By constructing EC || AB, we can split the given figure (AEDCBA) into two parts(Triangle ECD right angled at C and Rectangle AECB), Here, b = a + c = 30 m
Now, Area of Triangle DCE:
1/2 × CD × EC= 1/2 × c ×s
h=1/2 ×10× 12=60m2
Also, Area of rectangle AECB = AB × BC = h × a=12 × 20=240m2
Therefore, Area of trapezium AEDB = Area of Triangle DCE + Area of rectangle AECB = 60 + 240 = 300 =300m2
Area of quadrilateral ABCD
Diagonal AC divides the given quadrilateral into two triangles i.e. Triangle ABC and Triangle ADC.
Now, Area of Quadrilateral ABCD = Area of Triangle ABC + Area of Triangle ADC.
=1/2 × AC × h1 + 1/2 × AC × h2 =1/2 × d × (h1 +h2 )
Where, d = The length of diagonal of a quadrilateral.
Mensuration Class 8 Formulas
Mensuration class 8 NCERT Solutions (Examples)