Question

please help. me to find this please​

Answer 1

Step-by-step explanation:

here is your solution.

mark as BRAINLIEST

Answer 2

❖ Given ❖

• ABCD is a quadrilateral
• AB = 9 cm
• AD = 15 cm
• ∠ ABD = 90°
• CE ⏊ BD
• Ar (ABCD) = 72 cm²

❖ To find ❖

• Length of CD = ?

❖ Solution ❖

Using Pythagorean theorem in ∆ ABD

➹ AD² = AB² + BD²

➹BD² = AD² - AB²

➹BD² = (15)² - (9)²

➹BD² = 144

➹ BD = 12 cm

Now,

As we know

ar (∆) = 1/2×base ×height

so,

ar (∆ ABD) = 1/2 × AB × BD

ar (∆ ABD) = 1/2 × 9 × 12

ar (∆ ABD) = 54 cm²

Now,

as given that area of ABCD is 72 cm²

so,

ar (∆ CBD) = ar(ABCD) - ar (∆ ABD)

ar ( ∆ CBD) = ( 72 - 54 ) cm²

ar (∆ CBD) = 18 cm²

Then

also

ar (∆ CBD) = 1 /2 × BD × CE

18 cm² = 1 / 2 × 12 × CE

■ CE = 3 cm (Ans.)