Grade 5 Geometry worksheet on finding the area of isosceles and right triangles, with six illustrated triangles and their dimensions.

To solve the problem of finding the area of each triangle in the given worksheet, we will use the formula for the area of a triangle:

\[
\text{Area} = \frac{1}{2} \times \text{base} \times \text{height}
\]

Step-by-Step Solution:

#### 1) Isosceles Triangle (Problem 1):
- Base = 15 yd
- Height = 6.40 yd

\[
\text{Area} = \frac{1}{2} \times 15 \times 6.40 = \frac{1}{2} \times 96 = 48 \text{ square yards}
\]

#### 2) Right Triangle (Problem 2):
- Base = 12 yd
- Height = 11 yd

\[
\text{Area} = \frac{1}{2} \times 12 \times 11 = \frac{1}{2} \times 132 = 66 \text{ square yards}
\]

#### 3) Scalene Triangle (Problem 3):
- Base = 13 yd
- Height = 11 yd

\[
\text{Area} = \frac{1}{2} \times 13 \times 11 = \frac{1}{2} \times 143 = 71.5 \text{ square yards}
\]

#### 4) Scalene Triangle (Problem 4):
- Base = 10 in
- Height = 4.00 in

\[
\text{Area} = \frac{1}{2} \times 10 \times 4.00 = \frac{1}{2} \times 40 = 20 \text{ square inches}
\]

#### 5) Scalene Triangle (Problem 5):
- Base = 14 ft
- Height = 6.40 ft

\[
\text{Area} = \frac{1}{2} \times 14 \times 6.40 = \frac{1}{2} \times 89.6 = 44.8 \text{ square feet}
\]

#### 6) Isosceles Triangle (Problem 6):
- Base = 5 in
- Height = 5.45 in

\[
\text{Area} = \frac{1}{2} \times 5 \times 5.45 = \frac{1}{2} \times 27.25 = 13.625 \text{ square inches}
\]

Final Answers:

1. \( 48 \text{ square yards} \)
2. \( 66 \text{ square yards} \)
3. \( 71.5 \text{ square yards} \)
4. \( 20 \text{ square inches} \)
5. \( 44.8 \text{ square feet} \)
6. \( 13.625 \text{ square inches} \)

\[
\boxed{48, 66, 71.5, 20, 44.8, 13.625}
\]