Question
Study the given figure and identify the following triangles.
Image
(a) equilateral triangle
(b) isosceles triangles
(c) scalene triangles
(d) acute triangles
(e) obtuse triangles
(f) right triangles

Answer

(a) BC = 1 + 1 + 1 + 1 = 4 cm
AB = AC = 4 cm
∆ABC is an equilateral triangle.
(b) ∆ABC and ∆AEF are isosceles triangles.
Since AB = AC = 4 cm
Also AE = AF.
(c) In a scalene triangle, no two sides are equal.
∆AEB, ∆AED, ∆ADF, ∆AFC, ∆ABD, ∆ADC, ∆ABF and ∆AEC are scalene triangles.
(d) In an acute-angled triangle all the three angles are less than 90°
∆ABC, ∆AEF, ∆ABF and ∆AEC are acute-angled triangles.
(e) In an obtuse-angled triangle any one of the angles is greater than 90°
∆AEB and ∆AFC are obtuse angled triangles.
(f) In a right triangle, one of the angles is 90°
∆ADB, ∆ADC, ∆ADE and ∆ADF are right-angled triangles.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

The table given below contains some measures of the rectangle. Find the unknown values.
Length Breadth Perimeter Area
? 15 cm 60 cm ?
Assuming that the home to be the starting point, mark the following places in order on the number line as per instructions given below and write their corresponding integers.

Places: Home, School, Library, Playground, Park, Departmental Store, Bus Stand, Railway Station, Post Office, Electricity Board.
Instructions:
i) Bus Stand is 3 units to the right of Home.
ii) Library is 2 units to the left of Home.
iii) Departmental Store is 6 units to the left of Home.
iv) Post Office is 1 unit to the right of the Library.
v) Park is 1 unit right of Departmental Store.
vi) Railway Station is 3 units left of Post Office.
vii) Bus Stand is 8 units to the right of Railway Station.
viii) School is next to the right of Bus Stand.
ix) Playground and Library are opposite to each other.
x) Electricity Board and Departmental Store are at equal distance from Home.
The table given below contains some measures of the triangle. Find the unknown values.
Side 1 Side 2 Side 3 Perimeter
11 feet ? 9 feet 28 feet
Find the distance between the given lines using a set square at two different points on each of the pairs of lines and check whether they are parallel.
The LCM of two numbers is 210 and their HCF is 14. How many such pairs are possible?
Which is smaller? The difference between $2 \frac{1}{2}$ and $3 \frac{2}{3}$ or the sum of $1 \frac{1}{2}$ and $2 \frac{1}{4}$
Yasmin of class VI was given a task to count the number of books which are biographies, in her school library. The information collected by her is represented as follows.
Biographies Number of books
Mathematicians
Scientists
Novelists
Sportspersons
Politicians
Keys: Image
Observe the pictograph and answer the following questions.
(i) Which title has the maximum number of biographies?
(ii) Which title has the minimum number of biographies?
(iii) Which title has exactly half the number of biographies as Novelists?
(iv) How many biographies are there on the title of Sportspersons?
(v) What is the total number of biographies in the library?
Find the prime factorisation number by factor tree method and division method.
60
A squirrel wants to eat the grains quickly. Help the Squirrel to find the shortest way to reach the grains. (Use your scale to measure length of the line segments)
The table given below contains some measures of the rectangle. Find the unknown values.
Length Breadth Perimeter Area
? 4 feet ? 20 sq.feet