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Solution :

`/_ABC=/_ACB`<br>
O and E are a mid point of AB and AC<br>
DE||BC<br>
`/_ADE=/_ABC`<br>
`/_ADE=/_ACB`<br>
`/_ADE+/_EOB=/_ACB+/_EOB`<br>
`/_ACB+/_EOB=180^@`<br>
`/_ACB+/_EDB=180^@`.Transcript

Time | Transcript |
---|---|

00:00 - 00:59 | ABC is an isosceles triangle in which AB equal to AC if D and e are the midpoints of Ab and ac respectively then prove that point B C D and e are concyclic so first of all we will draw a triangle this is a triangle A B C and we have also given that is D and e are the midpoints of Ab and ac should D is the midpoint of a b and e is the midpoint of AC so when we meet d2d to bhaiya we have given that is D and e are midpoint of Ab and ac |

01:00 - 01:59 | and we have also given that is ab is equal to AC so let's suppose this is angle 1 and this is angle to and here are equal sides opposite angles are also equal so we can say that is angle 1 is equal to angle to because opposite angle opposite angle offer equal sides equal side are also equal so here we have given that is D and e are the midpoints of Ab and ac are so we can see by using the midpoint theorem that is bc is parallel to it by using midpoint theorem |

02:00 - 02:59 | and let's suppose this is angle 3 Subah using this week that is angle 1 + angle 3 is equal to 180 degree because Angle B and angle Aur Ko interior angle ko interior angle and we have already known that is bc BC is a parallel to de Subah using this we can say that is angle 1 + angle b is equal to 180 degree because one angle B and angle 3r co interior angle and further by using that angle 1 is equal to angle to we can say that is angle 2 + angle 3 |

03:00 - 03:59 | is equal to 180 degree Indian the triangle angle to an angle opposite angle and the sum of the opposite angle is equal to 180 3118 we can say sum of opposite angle is equal to 180 degree so here opposite angle sum is a 180 so we can say that is BCD BC BC CD is can cyclic so this is we have to prove thank you |

**What we learned in previous classes.**

**Area and Perimeter of Rectangle; square and triangles**

**Area and Perimeter of all type of parallelogram and rhombus**

**Herons's formula**

**Find the area of a triangle whose sides are `13 cm; 14 cm and 15 cm.`**

**Find the area of the quadrilateral ABCD; in which AB = 7 cm; BC =6 cm;CD =12 cm; DA= 15 cm and AC =9 cm**

**Radha made a picture of an aeroplane with coloured paper as shown in figure. Find the total area of the paper used.**