Heron's formula. Mathematics State Board, Class 9: lessons, tests, tasks.

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1.	Introduction to Heron's formula
2.	Area of a triangle - Heron's formula
3.	Application of Heron's formula
4.	Area of an equilateral triangle

1.	Multiple choice question I Difficulty: easy	3
2.	Two marks exercise problems Difficulty: medium	2
3.	Five marks example problems I Difficulty: hard	5
4.	Five marks example problems II Difficulty: hard	5
5.	Five marks exercise problems III Difficulty: hard	5
6.	Five marks exercise problems IV Difficulty: hard	5
7.	Five marks exercise problems V Difficulty: hard	5
8.	Five marks exercise problems VI Difficulty: hard	5
9.	Five marks exercise problems VII Difficulty: hard	5
10.	Five marks exercise problems VIII Difficulty: hard	5
11.	Five marks exercise problems IX Difficulty: hard	5
12.	Five marks exercise problems XI Difficulty: hard	5
13.	Five marks exercise problems X Difficulty: hard	5
14.	Five marks exercise problems XII Difficulty: hard	5

1.	Choose the correct answer Difficulty: easy	2
2.	Find the correct answer Difficulty: easy	2
3.	Find the area of an equilateral triangle Difficulty: easy	3
4.	Find the area of the triangle Difficulty: medium	3
5.	Calculate the area Difficulty: medium	4
6.	Area of the pizza Difficulty: medium	3
7.	Evaluate the area Difficulty: medium	3
8.	Calculate the area of the digital board Difficulty: medium	3
9.	Find the area of each colour cloth Difficulty: medium	4
10.	Calculate the area of the sign board Difficulty: medium	3
11.	Calculate the area of an isosceles triangle Difficulty: hard	4
12.	Find the area of the quadrilateral Difficulty: hard	4
13.	Calculate the area of the trapezium Difficulty: hard	4
14.	Calculate the area and cost of the land Difficulty: hard	4

1.	Determine the area of the plot Difficulty: hard	5
2.	Find the cost of painting the advertisement board Difficulty: hard	5
3.	Find the area of the unshaded region of the triangle Difficulty: hard	5
4.	Obtain the area of the triangular park Difficulty: hard	5

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